Dove's and their magic tricks!

Here's an interesting picture of a dove flying away from the birdbath.  Notice that it's wings are up but the shadow of the wings are out!  No Photoshop or trick photography here.

So why does this happen?  It's all timing.  The shutter doesn't expose the entire picture at once, but actually passes over the image area.  When the camera was exposing the top of the picture, the wings were up but by the time the bottom of the picture was exposed the bird's wings were out.  This all happened very quickly and its rare to capture a picture like this.